Dynamics of algebras in quantum unstable systems

MARCELO LOSADA; SEBASTIAN FORTIN; MANUEL GADELLA; FEDERICO HOLIK

INTERNATIONAL JOURNAL OF MODERN PHYSICS A

WORLD SCIENTIFIC PUBL CO PTE LTD

Lugar: London, UK; Año: 2018 vol. 33

0217-751X

We introduce a dynamical evolution operator for dealing with unstable physical process, such as scattering resonances, photon emission, decoherence and particle decay. With that aim, we use the formalism of rigged Hilbert space and represent the time evolution of quantum observables in the Heisenberg picture, in such a way that time evolution is non-unitary. This allows to describe observables that are initially non-commutative, but become commutative after time evolution. In other words, a non-abelian algebra of relevant observables becomes abelian when times goes to infinity. We finally present some relevant examples.